The tornado that swept through the Oklahoma City area on Monday killed at least 24 people and injured 240 more. Today, the National Weather Service said that more severe weather is expected in the U.S. over the next 24 hours, including the possibility of more tornadoes.

The future of health is in your hands — and mobile device. That’s the goal of the “healthfinder.gov Mobile App Challenge,” a contest sponsored by the U.S. Department of Health and Human Services and one of its websites to design a downloadable program in the name of prevention and wellness.